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