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