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