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