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)(15,21,26,27)(16,20,25,28)(17,22,18,23)(5,7,10,8)(6,11,9,12)(13,15,17,16,19,26,18,25)(14,20,23,21,24,28,22,27)(2,4)(5,6,10,9)(7,12,8,11)(13,16,17,26,19,25,18,15)(14,21,23,28,24,27,22,20)(5,8,10,7)(6,11,9,12)(13,17,19,18)(14,22,24,23)(15,25,26,16)(20,21,28,27)(5,9,10,6)(7,12,8,11)(13,17,19,18)(14,22,24,23)(15,16,26,25)(20,27,28,21)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.