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