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