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