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