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