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