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