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