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