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