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