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