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