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