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