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