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