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