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