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