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