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