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