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