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