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