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