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