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