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