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