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