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