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