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