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