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