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