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