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