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