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