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