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