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