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