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