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