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)(13,14,16,18)(15,17,19,20)(21,22)(23,31)(24,30)(25,29)(26,28)(27,33)(32,35)(34,36)(6,9)(10,12)(13,15,16,19)(14,17,18,20)(21,23)(22,27)(24,34)(25,33)(26,32)(28,36)(29,31)(30,35)(2,4)(5,7)(6,10)(8,11)(9,12)(15,19)(17,20)(21,24,25,26)(22,28,29,30)(23,32,33,34)(27,35,31,36)(7,11)(10,12)(22,28)(24,26)(27,36)(29,30)(31,35)(32,34) 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.