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