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