One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,8)(5,7)(9,10)(11,15)(12,14)(13,16) involution — undirected(1,3,6,2)(4,8,5,7)(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)(1,4,6,5)(2,7,3,8)(10,14)(13,15)(1,5,6,4)(2,7,3,8)(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.