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