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