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