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