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