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