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