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