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