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