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