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