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