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