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)(11,15)(12,14)(13,16)(17,18)(19,24)(20,22)(21,25)(23,26)(27,28)(29,32)(30,31) involution — undirected(1,3,6,2)(4,8,5,7)(9,11,12,16)(10,13,14,15)(17,19,22,30)(18,24,20,31)(21,28,23,29)(25,27,26,32)(10,14)(13,15)(17,20,22,18)(19,27,30,32)(21,25,23,26)(24,29,31,28)(1,4,6,5)(2,7,3,8)(10,14)(13,15)(17,21,22,23)(18,25,20,26)(19,28,30,29)(24,27,31,32)(1,5,6,4)(2,7,3,8)(11,16)(13,15)(18,20)(19,29)(21,23)(24,27)(28,30)(31,32)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.