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