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