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