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