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