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