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