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)(13,14,20,19)(15,17,21,27)(16,18,22,28)(23,26,25,24)(5,7,9,8)(6,10,11,12)(13,15)(14,17)(16,24)(18,23)(19,27)(20,21)(22,26)(25,28)(1,2,3,4)(13,16)(14,18)(15,23)(17,26)(19,28)(20,22)(21,25)(24,27)(5,8,9,7)(6,10,11,12)(13,17,20,27)(14,21,19,15)(16,25,22,23)(18,24,28,26)(13,18,20,28)(14,22,19,16)(15,24,21,26)(17,23,27,25)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.