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