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