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