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