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)(23,29)(24,32)(25,27)(26,35)(28,31)(30,34)(33,36) involution — undirected(1,2)(3,4)(5,7,9,15)(6,10,12,13)(8,14,16,20)(11,17,18,19)(22,27)(23,24)(30,35)(31,33)(2,4)(5,8,9,16)(6,11,12,18)(7,14,15,20)(10,17,13,19)(21,23,25,24)(22,28,27,36)(26,33,34,31)(29,30,32,35)(6,12)(10,13)(11,18)(17,19)(21,24,25,23)(22,29,27,32)(26,33,34,31)(28,30,36,35)(2,4)(7,15)(10,13)(14,20)(17,19)(23,24)(28,36)(29,32)(31,33) 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.