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