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)(9,18)(10,13)(11,16)(15,19)(17,20)(21,22,25,27,26,30,24,29)(23,28,33,34,31,35,32,36)(5,7,9,16,10,17,8,15)(6,11,12,14,13,19,18,20)(22,27)(24,25)(28,34)(29,30)(32,33)(35,36)(2,4)(21,23)(22,28)(24,32)(25,33)(26,31)(27,34)(29,36)(30,35) involution — undirected(5,8,10,9)(6,12,13,18)(7,15,17,16)(11,14,19,20)(23,31)(28,35)(32,33)(34,36)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.