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