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