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