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