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