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