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