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