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