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