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