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)(13,14,19,18)(15,16,20,17)(21,22)(23,28)(24,26)(25,27)(5,7,9,12)(6,8,10,11)(13,15)(14,17)(16,18)(19,20)(21,23)(22,24)(25,26)(27,28)(6,10)(7,12)(13,16,19,17)(14,20,18,15)(21,24,25,28)(22,26,27,23)(1,2)(3,4)(5,8)(6,7)(9,11)(10,12)(13,17,19,16)(14,20,18,15)(21,23)(22,24)(25,26)(27,28)(5,6)(7,8)(9,10)(11,12)(13,18,19,14)(15,16,20,17)(21,24)(22,23)(25,28)(26,27)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.