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