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