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