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