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