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