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