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