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