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