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