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