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