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