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