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