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