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