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