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