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