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