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