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