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