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