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