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