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