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