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