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