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