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