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