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