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