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