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