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