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