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