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