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