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