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