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