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