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