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