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