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