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