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)(23,26,30,33)(24,27,31,34)(29,32,35,36)(5,7)(6,10)(8,11)(9,12)(13,15,16,19)(14,17,18,20)(23,29)(24,31)(26,32)(27,34)(30,35)(33,36)(5,6,9,8)(7,10,12,11)(14,18)(17,20)(21,23,24,29,25,30,31,35)(22,26,27,32,28,33,34,36)(2,4)(5,8,9,6)(7,10,12,11)(23,30)(26,33)(29,35)(32,36)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.