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