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