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