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