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