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