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