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