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