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