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)(22,27)(25,28)(29,30)(31,35)(32,34)(33,36) involution — undirected(5,6)(7,13)(8,11)(9,12)(10,15)(14,19)(16,18)(17,20)(21,22,28,35,26,31,25,27)(23,29,34,36,24,33,32,30)(2,4)(5,7,9,15)(6,10,12,13)(8,16,17,14)(11,19,20,18)(21,23,26,24)(22,29,31,33)(25,32,28,34)(27,30,35,36)(5,8,9,17)(6,11,12,20)(7,14,15,16)(10,18,13,19)(21,24,26,23)(22,30,31,36)(25,32,28,34)(27,29,35,33)(6,12)(10,13)(11,20)(18,19)(23,24)(29,33)(30,36)(32,34) 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.