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