One vertex per element, one color per generator, with an edge from x to x·s.
(2,6)(3,4)(9,10)(11,15)(12,16)(13,14) involution — undirected(1,2)(3,7)(4,8)(5,6)(17,18,22,27)(19,25,30,32)(20,24,28,26)(21,31,29,23)(1,3,5,4)(2,7,6,8)(10,14)(15,16)(17,19,28,21,22,30,20,29)(18,23,24,32,27,31,26,25)(1,4,5,3)(2,8,6,7)(9,11,13,12)(10,15,14,16)(17,20,22,28)(18,24,27,26)(19,21,30,29)(23,25,31,32)(2,6)(7,8)(9,12,13,11)(10,16,14,15)(17,21,28,30,22,29,20,19)(18,25,24,23,27,32,26,31)A 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.