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