\documentclass{standalone} \usepackage{tikz} \begin{document} \begin{tikzpicture} \tikzstyle{node}=[circle,minimum size=1cm,font=\bf\sf]; \tikzstyle{inactive}=[fill=black!20]; \tikzstyle{active}=[fill=blue!20]; \tikzstyle{activepath}=[line width=1mm]; \tikzstyle{inactivepath}=[line width=0.25mm]; \node[node,active] (A) at (0,0) {A}; \node[node,inactive] (B) at (2,-1.5) {B}; \node[node,active] (C) at (1.5,1.5) {C}; \node[node,inactive] (D) at (2,4) {D}; \node[node,inactive] (E) at (6.5,4.5) {E}; \node[node,active] (F) at (4,1.5) {F}; \node[node,inactive] (G) at (4.5,-1.5) {G}; \node[node,inactive] (H) at (5,-3.5) {H}; \node[node,inactive] (I) at (6.5,-5.5) {I}; \node[node,inactive] (J) at (7,-1.5) {J}; \node[node,active] (K) at (6.6,1) {K}; \node[node,active] (L) at (9,2.5) {L}; \node[node,inactive] (M) at (10,0) {M}; \node[node,inactive] (N) at (11,-2) {N}; \node[node,inactive] (O) at (11,-7) {O}; \node[node,inactive] (P) at (13,-2) {P}; \node[node,active] (Q) at (12,3) {Q}; \draw[activepath] (A) -- (C); \draw[activepath] (C) -- (F); \draw[activepath] (F) -- (K); \draw[activepath] (K) -- (L); \draw[activepath] (L) -- (Q); \draw[inactivepath] (A) -- (B); \draw[inactivepath] (B) -- (G); \draw[inactivepath] (G) -- (F); \draw[inactivepath] (G) -- (H); \draw[inactivepath] (G) -- (J); \draw[inactivepath] (J) -- (K); \draw[inactivepath] (J) -- (M); \draw[inactivepath] (J) -- (N); \draw[inactivepath] (M) -- (L); \draw[inactivepath] (M) -- (N); \draw[inactivepath] (N) -- (P); \draw[inactivepath] (P) -- (Q); \draw[inactivepath] (P) -- (O); \draw[inactivepath] (H) -- (I); \draw[inactivepath] (I) -- (N); \draw[inactivepath] (I) -- (O); \draw[inactivepath] (D) -- (C); \draw[inactivepath] (D) -- (E); \draw[inactivepath] (E) -- (K); \draw[inactivepath] (E) -- (Q); \end{tikzpicture} \end{document}