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