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