I want to visualize fractional coloring by coloring my nodes with multiple colors.
I've tried adding another fill to each node but got an compile error in Overleaf.
This is the current graph I have. Could I get some help on how to get two or more colors going for each node?
\begin{center}
\begin{tikzpicture}[scale=1.8]
\node[circle,draw=black, fill=red, inner sep=2pt,minimum size=3pt] at ( -4, 0) (1){$1$};
\node[circle,draw=black, fill=lime, inner sep=2pt,minimum size=3pt] at ( -3.5, -1) (2){$2$};
\node[circle,draw=black, fill=red, inner sep=2pt,minimum size=3pt] at ( -3.5, -2) (3){$3$};
\node[circle,draw=black, fill=teal, inner sep=2pt,minimum size=3pt] at ( -2, -1.5) (4){$4$};
\node[circle,draw=black, fill=lime, inner sep=2pt,minimum size=3pt] at ( -2, -3) (5){$5$};
\node[circle,draw=black, fill=red, inner sep=2pt,minimum size=3pt] at ( -1, -1.5) (6){$6$};
\node[circle,draw=black, fill=teal, inner sep=2pt,minimum size=3pt] at ( -1, -3) (7){$7$};
\node[circle,draw=black, fill=lime, inner sep=2pt,minimum size=3pt] at ( 0, -2) (8){$8$};
\node[circle,draw=black, fill=red, inner sep=2pt,minimum size=3pt] at ( 1, -1.5) (9){$9$};
\node[circle,draw=black, fill=lime, inner sep=2pt,minimum size=3pt] at ( 2, -1.5) (10){$10$};
\node[circle,draw=black, fill=red, inner sep=2pt,minimum size=3pt] at ( 3, 0) (11){$11$};
\node[circle,draw=black, fill=red, inner sep=2pt,minimum size=3pt] at ( -3, 0) (12){$12$};
\node[circle,draw=black, fill=lime, inner sep=2pt,minimum size=3pt] at ( -2, 3.5) (13){$13$};
\node[circle,draw=black, fill=teal, inner sep=2pt,minimum size=3pt] at ( -1.5, 1) (14){$14$};
\node[circle,draw=black, fill=red, inner sep=2pt,minimum size=3pt] at ( -0.25, 2.75) (15){$15$};
\node[circle,draw=black, fill=lime, inner sep=2pt,minimum size=3pt] at ( 0, 0.5) (16){$16$};
\node[circle,draw=black, fill=teal, inner sep=2pt,minimum size=3pt] at ( -0.5, -1) (17){$17$};
\node[circle,draw=black, fill=lime, inner sep=2pt,minimum size=3pt] at ( 1.5, 5) (18){$18$};
\node[circle,draw=black, fill=red, inner sep=2pt,minimum size=3pt] at ( 0.75, 4) (19){$19$};
\node[circle,draw=black, fill=lime, inner sep=2pt,minimum size=3pt] at ( 0.75, 3) (20){$20$};
\node[circle,draw=black, fill=teal, inner sep=2pt,minimum size=3pt] at ( 1.75, 1.25) (21){$21$};
\node[circle,draw=black, fill=red, inner sep=2pt,minimum size=3pt] at ( 1, -0.25) (22){$22$};
\node[circle,draw=black, fill=teal, inner sep=2pt,minimum size=3pt] at ( 2.25, 4.5) (23){$23$};
\node[circle,draw=black, fill=red, inner sep=2pt,minimum size=3pt] at ( 2.5, 2) (24){$24$};
\node[circle,draw=black, fill=lime, inner sep=2pt,minimum size=3pt] at ( 2, -0.25) (25){$25$};
\draw[<->, thick] (1) -- (2) node [];
\draw[<->, thick] (1) -- (4) node [];
\draw[<->, thick] (2) -- (3) node[];
\draw[<->, thick] (2) -- (4) node[];
\draw[<->, thick] (3) -- (4) node[];
\draw[<->, thick] (3) -- (5) node[];
\draw[<->, thick] (4) -- (5) node[];
\draw[<->, thick] (4) -- (6) node[];
\draw[<->, thick] (5) -- (7) node[];
\draw[<->, thick] (6) -- (7) node[];
\draw[<->, thick] (6) -- (8) node[];
\draw[<->, thick] (7) -- (8) node[];
\draw[<->, thick] (8) -- (9) node[];
\draw[<->, thick] (9) -- (10) node[];
\draw[<->, thick] (10) -- (11) node[];
\draw[<->, thick] (12) -- (13) node[];
\draw[<->, thick] (12) -- (14) node[];
\draw[<->, thick] (12) -- (16) node[];
\draw[<->, thick] (12) -- (17) node[];
\draw[<->, thick] (13) -- (14) node[];
\draw[<->, thick] (13) -- (15) node[];
\draw[<->, thick] (14) -- (15) node[];
\draw[<->, thick] (14) -- (16) node[];
\draw[<->, thick] (15) -- (16) node[];
\draw[<->, thick] (15) -- (20) node[];
\draw[<->, thick] (15) -- (21) node[];
\draw[<->, thick] (16) -- (17) node[];
\draw[<->, thick] (16) -- (22) node[];
\draw[<->, thick] (17) -- (22) node[];
\draw[<->, thick] (18) -- (19) node[];
\draw[<->, thick] (18) -- (23) node[];
\draw[<->, thick] (19) -- (20) node[];
\draw[<->, thick] (19) -- (23) node[];
\draw[<->, thick] (20) -- (21) node[];
\draw[<->, thick] (20) -- (23) node[];
\draw[<->, thick] (20) -- (24) node[];
\draw[<->, thick] (21) -- (22) node[];
\draw[<->, thick] (21) -- (24) node[];
\draw[<->, thick] (21) -- (25) node[];
\draw[<->, thick] (22) -- (25) node[];
\draw[<->, thick] (23) -- (24) node[];
\draw[<->, thick] (24) -- (25) node[];
\end{tikzpicture}
\end{center}
