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