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)(17,18,20,23)(19,24,27,22)(21,25,28,31)(26,32,29,30)(1,3)(2,5)(4,8)(6,7)(9,11,13,12)(10,14,15,16)(19,26)(21,28)(22,30)(24,32)(25,31)(27,29)(9,12,13,11)(10,14,15,16)(17,19,20,27)(18,22,23,24)(21,29,28,26)(25,32,31,30)(2,6)(5,7)(18,23)(22,24)(25,31)(30,32) involution — undirected(3,8)(5,7)(17,19,20,27)(18,24,23,22)(21,29,28,26)(25,30,31,32)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.