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