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