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