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