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)(19,24)(20,25)(21,23)(22,26)(27,31)(28,30)(29,32) involution — undirected(1,3,4,8)(2,5,6,7)(9,10)(11,15)(12,14)(13,16)(19,27)(24,31)(28,29)(30,32)(9,11,12,16)(10,13,14,15)(18,23)(20,21)(24,30)(25,26)(28,29)(31,32)(2,6)(5,7)(17,19,22,27)(18,24,26,31)(20,29,21,28)(23,30,25,32)(3,8)(5,7)(10,14)(13,15)(17,20,22,21)(18,25,26,23)(19,28,27,29)(24,30,31,32)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.