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