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