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