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