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