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