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