\documentclass{standalone}
\usepackage[paperwidth=\maxdimen,paperheight=\maxdimen]{geometry}
\usepackage{pgf,tikz}
\begin{document}

\begin{tikzpicture}[x=24pt, y=24pt, draw=white, double=black, line width=2.1pt]
	\node (4) at (0, 0) {$4$};
	\node (5) at (2, 0) {$5$};
	\node (1) at (5, 0) {$1$};
	\node (6) at (10, 0) {$6$};
	\node (2) at (28, 0) {$2$};
	\node (3) at (34, 0) {$3$};

	\draw[double=white,draw=green] (4) -- (0, -8) -- (19, -8) -- (19, 10) -- (37, 10) -- (37, -3) -- (31, -3) -- (31, 3) -- (25, 3) -- (25, -9) -- (43, -9) -- (43, 16) -- (13, 16) -- (13, -1) -- (9, -1) -- (9, 18) -- (46, 18) -- (46, -12) -- (23, -12) -- (23, 5) -- (33, 5) -- (33, -1) -- (35, -1) -- (35, 7) -- (21, 7) -- (21, -14) -- (48, -14) -- (48, 20) -- (2, 20) -- (5);
	\draw[double=white,draw=blue] (6) -- (10, 17) -- (45, 17) -- (45, -10) -- (24, -10) -- (24, 4) -- (32, 4) -- (32, -2) -- (36, -2) -- (36, 8) -- (20, 8) -- (20, -15) -- (49, -15) -- (49, 21) -- (1, 21) -- (1, -1) -- (3, -1) -- (3, 2) -- (7, 2) -- (7, -4) -- (15, -4) -- (15, 14) -- (41, 14) -- (41, -7) -- (27, -7) -- (27, 1) -- (29, 1) -- (29, -5) -- (39, -5) -- (39, 12) -- (17, 12) -- (17, -6) -- (5, -6) -- (1);
	\draw[double=white,draw=red] (2) -- (28, -6) -- (40, -6) -- (40, 13) -- (16, 13) -- (16, -5) -- (6, -5) -- (6, 1) -- (4, 1) -- (4, -7) -- (18, -7) -- (18, 11) -- (38, 11) -- (38, -4) -- (30, -4) -- (30, 2) -- (26, 2) -- (26, -8) -- (42, -8) -- (42, 15) -- (14, 15) -- (14, -2) -- (8, -2) -- (8, 19) -- (47, 19) -- (47, -13) -- (22, -13) -- (22, 6) -- (34, 6) -- (3);
	\draw[double=green] (5) -- (2, -3) -- (10, -3) -- (6);
	\draw[double=blue] (3) -- (34, -11) -- (12, -11) -- (12, 4) -- (0, 4) -- (4);
	\draw[double=red] (1) -- (5, 3) -- (11, 3) -- (11, -16) -- (44, -16) -- (44, 9) -- (28, 9) -- (2);
\end{tikzpicture}
\end{document}