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