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