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