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