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