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