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