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