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