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