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