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)(13,14,18,20)(15,21,23,22)(16,17,25,26)(19,27,28,24)(5,7,10,8)(6,11,9,12)(13,15,17,24,18,23,26,27)(14,19,16,21,20,28,25,22)(2,4)(5,6,10,9)(7,12,8,11)(13,16,17,20,18,25,26,14)(15,22,24,19,23,21,27,28)(5,8,10,7)(6,11,9,12)(15,23)(19,28)(21,22)(24,27)(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.