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