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