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