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