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