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