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