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