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