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