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