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