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