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