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