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