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