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