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)(14,19)(15,23)(16,17)(20,25)(21,22)(24,26)(1,2,4,3)(5,7)(6,10)(8,11)(9,12)(14,19)(15,24)(16,17)(21,22)(23,26)(27,28)(5,8,9,6)(7,11,12,10)(13,14,17,22,18,21,16,19)(15,25,24,27,26,20,23,28)(7,12)(10,11)(13,15,16,23,18,26,17,24)(14,20,19,27,21,25,22,28)(1,3,4,2)(14,21)(19,22)(20,25)(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.