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