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