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