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