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