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