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