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