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)(12,14)(13,16)(18,23)(20,28)(21,24)(25,30)(27,31)(29,32) involution — undirected(2,5)(3,8)(9,11)(10,13)(12,16)(14,15)(17,18,24,28,22,20,21,23)(19,25,31,32,26,29,27,30)(1,3,4,8)(2,6,5,7)(10,14)(11,16)(17,19)(18,25)(20,29)(21,27)(22,26)(23,30)(24,31)(28,32)(2,5)(6,7)(10,14)(11,16)(18,20)(19,26)(23,28)(27,31) involution — undirected(2,5)(6,7)(10,14)(13,15)(17,20,21,28,22,18,24,23)(19,25,27,30,26,29,31,32)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.