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