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