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