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