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