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