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