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