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