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)(11,15)(12,13)(14,16)(17,18)(19,21)(20,22)(23,25)(24,28)(26,30)(27,31)(29,32) involution — undirected(1,2,6,8)(3,5,7,4)(10,13)(14,15)(17,19,23,28)(18,24,25,21)(20,26,29,31)(22,27,32,30)(1,3,6,7)(2,4,8,5)(9,10)(11,14)(12,13)(15,16)(20,29)(22,32)(26,31)(27,30)(1,4,6,5)(2,3,8,7)(9,11)(10,14)(12,16)(13,15)(17,20)(18,22)(19,26)(21,30)(23,29)(24,27)(25,32)(28,31)(1,2)(3,4)(5,7)(6,8)(17,21,23,24)(18,19,25,28)(20,27,29,30)(22,31,32,26)(1,5,6,4)(2,7,8,3)(17,22)(18,20)(19,27)(21,31)(23,32)(24,26)(25,29)(28,30)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.