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