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)(11,15)(12,14)(13,16)(17,18)(19,24)(20,22)(21,23)(26,29)(30,32)(1,3)(2,6)(4,7)(5,8)(9,11)(10,12)(13,14)(15,16)(17,19,21,22)(18,20,23,24)(27,31)(30,32)(9,12)(10,14)(11,16)(13,15)(17,18)(19,24)(20,22)(21,23)(25,26)(27,30)(28,29)(31,32) involution — undirected(1,4,5,6)(2,3,7,8)(9,12)(10,11)(13,15)(14,16)(17,18)(19,20)(21,23)(22,24)(25,27)(26,30)(28,31)(29,32)(1,3)(2,4)(5,8)(6,7)(9,11)(10,15)(12,16)(13,14)(17,20)(18,22)(19,23)(21,24)(25,26)(27,30)(28,29)(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.