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