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