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