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