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