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