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