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