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