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