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