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