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