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