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