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