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