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