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