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