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