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