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