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)(21,22,24,28)(23,26,30,33)(25,27,32,29)(31,34,36,35)(1,2)(3,4)(5,7,8,11)(6,9,10,12)(15,19)(17,20)(21,23)(22,26)(24,30)(25,31)(27,34)(28,33)(29,35)(32,36)(6,10)(9,12)(13,15,16,19)(14,17,18,20)(23,30)(26,33)(31,36)(34,35)(2,4)(22,27)(25,32)(26,34)(28,29)(31,36)(33,35) 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.