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