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