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