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)(17,18,22,25)(19,26,30,24)(20,21,32,23)(27,28,29,31)(1,3)(2,6)(4,7)(5,8)(9,11,12,15)(10,13,14,16)(17,19)(18,24)(20,31)(21,29)(22,30)(23,27)(25,26)(28,32)(10,14)(13,16)(18,25)(19,27)(21,23)(24,28)(26,31)(29,30) involution — undirected(2,7)(3,8)(10,14)(13,16)(17,20)(18,21)(19,28)(22,32)(23,25)(24,27)(26,29)(30,31) involution — undirected(1,4,5,6)(2,3,7,8)(17,21,22,23)(18,20,25,32)(19,29,30,27)(24,31,26,28)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.