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)(23,30)(24,28)(25,27)(26,33)(29,34)(31,35)(32,36)(6,7)(8,12)(13,14)(15,17)(16,19)(18,20)(21,23,27,24)(22,28,25,30)(26,32,34,31)(29,36,33,35)(6,7)(10,11)(14,15)(18,19)(21,24,27,23)(22,28,25,30)(26,32,34,31)(29,35,33,36)(1,2)(3,4)(5,7,9,6)(8,10,12,11)(13,15,17,14)(16,18,20,19)(21,25,27,22)(23,30,24,28)(26,29,34,33)(31,35,32,36)(5,8,9,12)(6,10,7,11)(13,16,17,20)(14,18,15,19)(21,26,27,34)(22,29,25,33)(23,31,24,32)(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.