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