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