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