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