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