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