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)(16,24)(17,22)(18,19)(21,26)(23,28)(25,27)(9,10,11,12)(14,19)(17,27)(20,28)(21,24)(5,6,8,7)(9,10)(11,12)(13,15)(14,20)(16,25)(17,21)(18,23)(19,28)(22,26)(24,27)(1,2,3,4)(5,7,8,6)(13,16,18,26)(14,21,19,24)(15,22,23,25)(17,20,27,28)(13,17,18,27)(14,22,19,25)(15,21,23,24)(16,20,26,28)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.