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