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