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