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