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