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