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