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