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