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