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