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