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