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