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