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