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