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