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