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