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