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