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