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