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