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