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