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