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