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