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