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