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