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