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