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