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