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