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)(17,18,23,25)(19,28,30,24)(20,26,29,22)(21,27,31,32)(1,3)(2,4)(5,7)(6,8)(9,11,13,16)(10,14,12,15)(17,19,23,30)(18,24,25,28)(20,21,29,31)(22,27,26,32)(3,7)(4,8)(9,10,13,12)(11,14,16,15)(18,25)(22,26)(24,28)(27,32)(2,6)(4,8)(9,12,13,10)(11,15,16,14)(17,20)(18,26)(19,21)(22,25)(23,29)(24,32)(27,28)(30,31)(1,4)(2,3)(5,8)(6,7)(17,21)(18,27)(19,29)(20,30)(22,28)(23,31)(24,26)(25,32) involution — undirected(1,2)(3,4)(5,6)(7,8)(17,22,23,26)(18,20,25,29)(19,27,30,32)(21,28,31,24)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.