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