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