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