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