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