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