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