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