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)(13,14,17,15)(16,20,25,19)(18,21,26,22)(23,27,28,24)(6,9)(10,12)(13,15,17,14)(16,23,25,28)(18,21,26,22)(19,24,20,27)(1,2,3,4)(13,16,17,25)(14,19,15,20)(18,27,26,24)(21,23,22,28)(5,7,8,11)(6,10,9,12)(14,15)(16,24)(18,26)(19,23)(20,28)(25,27)(13,16,17,25)(14,20,15,19)(18,27,26,24)(21,28,22,23)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.