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