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