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