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