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