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