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