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