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