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