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