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