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