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