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