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