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