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