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