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