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