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)(31,32)(35,36) involution — undirected(5,6)(7,11)(8,12)(9,10)(13,19)(14,17)(15,20)(16,18)(21,22,26,29)(23,28,30,35)(24,27,25,33)(31,34,32,36)(2,4)(6,10)(11,17)(12,18)(19,20)(21,23,26,30)(22,28,29,35)(24,31,25,32)(27,34,33,36)(5,7,9,14)(6,11,10,17)(8,15,16,13)(12,20,18,19)(23,30)(28,35)(31,32)(34,36)(5,8,9,16)(6,12,10,18)(7,13,14,15)(11,19,17,20)(21,24,26,25)(22,27,29,33)(23,31,30,32)(28,34,35,36)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.