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