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