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