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