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