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