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