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