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