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