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