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