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