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