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