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)(12,16)(13,15)(17,18,22,26,21,23,30,31)(19,24,28,32,27,20,25,29)(1,3,4,8)(2,5,6,7)(9,11,13,12)(10,14,15,16)(18,23)(19,27)(25,28)(26,31)(2,6)(5,7)(9,12,13,11)(10,14,15,16)(17,19,21,27)(18,24,23,20)(22,28,30,25)(26,32,31,29)(3,8)(5,7)(18,23)(19,27)(25,28)(26,31) involution — undirected(2,6)(5,7)(17,20,22,29,21,24,30,32)(18,25,26,19,23,28,31,27)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.