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