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