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