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