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