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