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