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