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