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