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