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