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