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)(11,15)(12,16)(13,14)(18,23)(19,27)(26,30)(28,29) involution — undirected(1,3,4,8)(2,5,6,7)(17,18,21,23)(19,25,27,32)(20,26,22,30)(24,29,31,28)(10,14)(15,16)(17,19)(18,24)(20,28)(21,27)(22,29)(23,31)(25,30)(26,32) involution — undirected(2,6)(5,7)(9,11,13,12)(10,15,14,16)(17,19)(18,25)(20,29)(21,27)(22,28)(23,32)(24,30)(26,31)(3,8)(5,7)(9,12,13,11)(10,16,14,15)(17,20)(18,23)(19,28)(21,22)(24,31)(27,29)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.