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