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