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