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