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