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