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