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