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