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