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