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