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