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