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