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