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)(13,14,18,15)(16,19,24,21)(17,22,25,20)(23,27,28,26)(5,7,9,12)(6,10,8,11)(13,14,18,15)(16,21,24,19)(17,20,25,22)(23,27,28,26)(2,3)(5,6,9,8)(7,10,12,11)(14,15)(17,25)(19,21)(23,28)(1,3,4,2)(13,15,18,14)(16,19,24,21)(17,22,25,20)(23,26,28,27)(13,16,18,24)(14,19,15,21)(17,23,25,28)(20,26,22,27)(5,8,9,6)(7,11,12,10)(13,17)(14,20)(15,22)(16,23)(18,25)(19,26)(21,27)(24,28)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.