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)(13,14,19,25,20,23,18,24)(15,26,17,21,16,22,27,28)(2,4)(13,15,20,16)(14,21,23,28)(17,19,27,18)(22,25,26,24)(6,9)(10,12)(13,16,19,27,20,15,18,17)(14,22,25,28,23,26,24,21)(13,17,19,16,20,27,18,15)(14,21,25,22,23,28,24,26)(5,7,8,11)(6,10,9,12)(14,23)(21,28)(22,26)(24,25)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.