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