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