One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,6)(7,15)(8,12)(9,23)(10,14)(11,18)(13,24)(16,31)(17,27)(19,26)(20,30)(21,35)(22,29)(25,33)(28,32)(34,36) involution — undirected(5,7,9,18,10,19,24,17)(6,11,13,15,14,27,23,26)(8,20,21,33,22,16,32,34)(12,25,28,30,29,36,35,31)(5,8,10,22)(6,12,14,29)(7,16)(9,21,24,32)(11,25)(13,28,23,35)(15,30)(17,33)(18,34)(19,20)(26,31)(27,36)(2,4)(7,17)(9,24)(11,26)(13,23)(15,27)(16,33)(18,19)(20,34)(21,32)(25,31)(28,35)(30,36) 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.