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