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