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