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