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