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