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