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