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