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