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