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