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