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