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