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