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