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