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