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)(16,23,25,28)(20,27,24,26)(2,4)(5,7,9,8)(6,10,12,11)(13,15)(14,17)(16,24)(18,22)(19,21)(20,25)(23,26)(27,28)(13,16,18,27,19,25,17,26)(14,20,21,28,22,24,15,23)(1,2,3,4)(13,15,17,22,19,21,18,14)(16,23,26,24,25,28,27,20)(5,8,9,7)(6,11,12,10)(16,25)(20,24)(23,28)(26,27)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.