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