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