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