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