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