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