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)(16,22,27,28)(17,25,26,21)(1,2)(3,4)(5,7,9,8)(6,10,11,12)(13,15)(14,18)(16,25)(17,28)(19,24)(20,23)(21,27)(22,26)(13,16,20,27)(14,21,24,25)(15,22,23,28)(17,18,26,19)(2,4)(5,8,9,7)(6,10,11,12)(13,17)(14,22)(15,25)(16,18)(19,27)(20,26)(21,23)(24,28)(6,11)(10,12)(13,18,20,19)(14,23,24,15)(16,26,27,17)(21,28,25,22)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.