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