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