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