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