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