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