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