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