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