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