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