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)(18,23)(20,30)(24,27)(26,31) involution — undirected(1,3,5,4)(2,6,8,7)(9,11,12,15)(10,13,14,16)(17,18)(19,26)(20,25)(21,23)(22,30)(24,29)(27,32)(28,31)(1,3,5,4)(2,7,8,6)(10,14)(13,16)(17,19,21,28)(18,24,23,27)(20,31,30,26)(22,32,25,29)(1,3,5,4)(2,7,8,6)(17,20,21,30)(18,25,23,22)(19,27,28,24)(26,32,31,29)(1,4,5,3)(2,6,8,7)(18,20)(22,25)(23,30)(24,31)(26,27)(29,32)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.