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