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