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