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