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