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