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