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