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