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