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