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