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