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