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