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