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