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