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