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