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