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