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