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