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