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