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