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