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