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