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