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