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