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