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