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