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