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