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