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