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