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