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