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