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