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