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