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