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