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