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