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