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)(21,22,27,31)(23,28,26,35)(24,33,25,30)(29,34,36,32)(1,2)(3,4)(5,7)(6,11)(8,15)(9,18)(10,16)(12,19)(13,14)(17,20)(21,23,27,26)(22,28,31,35)(24,34,25,32)(29,33,36,30)(2,4)(21,24,27,25)(22,29,31,36)(23,32,26,34)(28,30,35,33)(5,8,10,9)(6,12,13,17)(7,15,16,18)(11,19,14,20)(21,25,27,24)(22,30,31,33)(23,32,26,34)(28,29,35,36)(2,4)(5,9,10,8)(6,12,13,17)(7,15,16,18)(11,20,14,19)(21,23,27,26)(22,28,31,35)(24,32,25,34)(29,30,36,33)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.