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