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