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