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