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