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