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)(13,14,17,19)(15,16,20,18)(21,22,25,28)(23,24,27,26)(5,6,9,7)(8,11,12,10)(13,15,17,20)(14,18,19,16)(6,7)(10,11)(14,19)(16,18)(21,23,25,27)(22,26,28,24)(1,2)(3,4)(5,7,9,6)(8,11,12,10)(13,16)(14,15)(17,18)(19,20)(21,22)(23,26)(24,27)(25,28)(5,8,9,12)(6,10,7,11)(13,15)(14,16)(17,20)(18,19)(21,24,25,26)(22,27,28,23)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.