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