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