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