One vertex per element, one color per generator, with an edge from x to x·s.
(2,3)(5,6)(7,11)(8,13)(9,12)(10,15)(14,22)(16,24)(17,23)(18,26)(19,28)(20,27)(21,25)(29,32)(30,35)(31,34)(33,36) involution — undirected(1,2)(3,4)(5,7,10,18)(6,11,15,26)(8,16,19,30)(9,21,22,17)(12,25,14,23)(13,24,28,35)(20,33,32,31)(27,36,29,34)(1,3,4,2)(6,12)(9,22)(11,23)(13,27)(14,15)(17,21)(20,32)(24,34)(25,26)(28,29)(31,33)(35,36)(5,8)(6,13)(7,16)(9,20)(10,19)(11,24)(12,27)(14,29)(15,28)(17,31)(18,30)(21,33)(22,32)(23,34)(25,36)(26,35) involution — undirected(8,19)(13,28)(16,30)(20,32)(24,35)(27,29)(31,33)(34,36) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.