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