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