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