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