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)(14,18)(16,19)(21,22)(23,26)(24,29)(25,30)(27,31)(28,33)(32,34)(35,36) involution — undirected(5,7,9,12)(6,10,11,8)(13,14,17,18)(15,19,20,16)(22,23)(24,31)(25,33)(34,35)(5,7,9,12)(6,8,11,10)(13,15,17,20)(14,16,18,19)(21,23,26,22)(24,29,31,27)(25,28,33,30)(32,34,36,35)(1,2,3,4)(5,7)(6,8)(9,12)(10,11)(13,15)(14,16)(17,20)(18,19)(21,24)(22,27)(23,29)(25,32)(26,31)(28,34)(30,35)(33,36)(5,8)(6,7)(9,10)(11,12)(13,16)(14,15)(17,19)(18,20)(21,25)(22,28)(23,30)(24,32)(26,33)(27,34)(29,35)(31,36) 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.