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