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