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