One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,8)(5,6)(9,10,13,12)(11,15,16,14)(18,23)(21,30)(24,31)(25,28)(9,11,13,16)(10,14,12,15)(17,18)(19,24)(20,28)(21,26)(22,23)(25,29)(27,31)(30,32)(2,6)(7,8)(18,23)(20,29)(24,31)(26,32) involution — undirected(1,2)(3,7)(4,8)(5,6)(9,10,13,12)(11,14,16,15)(17,19,22,27)(18,24,23,31)(20,26,29,32)(21,25,30,28)(1,3,5,4)(2,7,6,8)(9,12,13,10)(11,15,16,14)(17,20,22,29)(18,25,23,28)(19,26,27,32)(21,24,30,31)(1,4,5,3)(2,8,6,7)(17,21,22,30)(18,26,23,32)(19,25,27,28)(20,24,29,31)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.