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