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