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